feat: update material-ui@4.x (#123)

* chore: update material-ui@4.x

* test: update test for ActionBar and TestField

* chore: add types

* chore: update types

* test: update test for Author

* chore: fixed bunch of unit test

* chore: remove unused import

* chore: remove comments

* chore: replace shallow my mount

* chore: update git hooks

* chore: fix styles

* chore: update dependencies

* chore: remove types material-ui

src/components/Developers/Developers.tsx

@@ -33,7 +33,7 @@ const Developers: FC<Props> = ({ type, visibleMax }) => {
 
     return (
       <Fragment>
-        <Heading variant={'subheading'}>{type}</Heading>
+        <Heading variant={'subtitle1'}>{type}</Heading>
         <Content>
           {listVisibleDevelopers.map(developer => (
             <Details key={developer.email}>{renderDeveloperDetails(developer, packageMeta)}</Details>